Improvement in printing-presses



2 Sheets-Sheet 1.

EQDUMMER. Printing-Presses.

No. 197,021. Patented Nov. 13,1877.

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".FETERS, FHOTO-LITHOGRAPHER. WASHMGTON D (1 2 Sheets-Sheet, 2. E.DUMMER. Printing-Presses.

No. 197,021. Patented Nov. 13,1877.

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N.FETERS. PHOTO-UYHOGEAPHER. WASHINQTO'N. D C.

Uivrrnn STATES PATENT OFFICE.

EDWARD DUM-MER, OF BOSTON, ASSIGNOR OF ONE-HALF HIS RIGHT TO DAVID W.WATSON, OF MALDEN, MASSACHUSETTS.

lM PROVEMENT IN PRlNTlNG-PRESSES.

Specification forming part of Letters Patent No. 197,021, dated November13, 1877; application filed March 6, 1877.

I Boston, in the county of Suffolk and State of Massachusetts, haveinvented a new and useful Improvement in Printing-Presses, whichimprovement is fully set forth in the following specification, referencebeing had to the ac companying drawings. The object of my invention is,first, to carry the inking roll or rolls over the form from which theimpression is to be taken'by means of bands or chains passing aboutpulleys rotating continuously in one direction; secondly, to so'locate'the'ink-plate in reference to the bed of the press, and soconstruct the body of the press, that the" inking roll or rolls may becarried over the' ink-plate by the bands or chains as they' continuetheir movement, as aforesaid; thirdly, to so construct'the body of thepress, and so arrange'the band 'or chainpulleys and their bearings, incombination with springs, that the bands or chains shall bekept tautandin position for smoothly working, and shall cause the inking roll orrolls to press upon the form and ink-plate; 'fourthly, to so arrange themain driven-gear andthe shaft that bears the cranks, which, in anoscillating press, in conjunction with the side arms, swing theplatenandgive the impression, that the 'platen may fall backward from the form orbed morerapidly than it approaches the same, and that the platen mayhave a cessation of its oscillating movement when at its farthestdistance from the form or bed, and alsothat the oscillation of theplaten may be stopped While the motion of the'driving parts continues;-fifthly,' to render the quick backward movement of the platen positiveand in proper time by means of a cam and a projection or geanteeththereon on the driving-shaft acting on a projection or gear-teeth on thedriven shaft.

- In the drawings, Figure 1 is an elevation, showing the rear view of anoscillating press embodying my invention, part of the shellcover andink-plate being broken away. Fig. 2 is a vertical section taken on andshowing what may be seen beyond to the right of line 1 1 of Fig.1. Fig.3 is an elevation of one end of the press, the end on the right in Fig.1, part of the standard or side being broken away. Fig. 4 is anelevation of the end of the press on the left in Fig. 1, part of thestandard or side being broken away. Figs. 5 and 6 show the relativepositionsof the chains or bands, their pulleys, the springs for keepingthe chains or bands taut, the inking-roll, and the arms or levers forholding the inking-roll.

The body of the press here represented consists of two parts, each ofwhich may be cast as one piece. Onerthe main partconsists of the sidesor standards A, bed B, with supporting-ribs O, a, b, and 0, and ways orinkroll guides-d, solid connections D between bed and standards, andcross or staying bar E. The other part is the shell or cover F, bearingthe ways or ink-roll guides e, and is fixed to the main part by thescrews f in position to cause the guides d and e to coincide andmeet, asshown.

At the back of the bed B are formed, by the ribs 0. and b, the recesses,one on each side, in which are placed the springs g. Projections h areformed on the inner face'of the shell part F, so as to cover therecesses and retain the springs g therein. The rib O has formed with ita projection, which has a bearing, i, for the stud j formed on theink-plate G. The shell part F has a large opening, circular in thiscase, that the parts within the space between part F and the main partmay be readily adjusted, and which opening is covered when the ink-plateis in place-that is, when the stud j is in its bearing z.

The platen H, with the cross-bar I bearing the arms and adjusting-screwsk, oscillates by the supports Z moving on the pivots at m. A shaft, K,bearing the crank-arms J, which are fixed solidly thereto, rests in abearing, n, in one of the standards A and connecting parts D, andin thehub of the gear L. The side arms M are pivoted at 0 to the crossbar I,and at p to the crank-arms J. The gear L is supported by its hub restingin a bearing in the other standard A and connecting part D, and revolvesabout the same central line with the shaft K, but may revolveindependently of the shaft K. A clutch, N, is placed on the shaft K, andcaused to turn therewith by means of the pin q, and arranged to slide onthe shaft a sufiicient distance to be moved in or out of engagement withthe projection r on the hub of the gear L, by means of the rod sextending outside of the body of the press to be grasped by the handapplied at the knob t. There is a suflicient distance between theprojection on the clutch N and that on the hub of the gear L to allowthe shaft K to move a certain distance independently of the gear L,should the shaft move faster than the gear.

011 the shaft K is a spur-wheel to catch in the ratchet a on the underside of the inkplate G, to turn the latter intermittingly at the propertime.

0 is the main driving-shaft, which may be revolved by any suitableapplication of power, but here shown as having a crank, P, to be workedby a rod connected with a foot-lever. (Not shown.)

On the shaft 0 are fastened rigidly the pulleys R, here shown as havingsprockets 2* to engage in the chains S, which, as endless bands, passalso over the pulleys T. The latter pulleys revolve independently ofeach other, and freely on studs, which are extensions of a bar, U. Thisbar has projections which slide in the recesses for the springs g, andare pressed against by the springs g, and guided for a slight verticalmovement.

The chains S carry the inking-roll V by means of the arms w, having thebearin gs w for the inking-roll. The arms w are so connected with thechains that a part of each arm forms a link. The form of the arms w issuch that when the inking-roll passes over the form and ink-plate thechains are drawn a little out of line, the arms w acting as levers topress the inking-roll to form and ink-plate, and operated by the chainsor hands.

The arrangement of the chains, their pulleys, and inking-roll and leversis more clearly illustrated in Figs. 5 and 6. The sprocketdriving-pulleys R are fixed on the drivingshaft 0, which runs in fixedbearings, while the pulleys T run on bearin gs which are pressed upward,or in a direction from the shaft 0, by the springs 9. Hence the chains Sare kept taut, and their tendency is to run in straight lines betweenthe pulleys R and T; but the inking-roll V, having its bearings attachedto the chains, and the line of the ways d and e, or of the plane of formand ink-plate, being located at such distance from the chains, thechains are drawn out of said straight lines, and therefore the springs ywill cause a pressure of the inking-roll on the form and inkplate.Furthermore, the arms w, which bear the inking-roll shaft, are formed totake the place of one or more linksone in this caseso that they alsoform levers, being drawn or operated by the draft of the chains, as hereillustrated.

On the driving-shaft O, and, as here shown, as one piece with the crankP, is the cam W and carrier, having the teeth or projections y to engagewith the teeth or projections z firmly secured to the shaft K. Abalance-wheel (not here shown) should be fixed on the other end of theshaft 0.

The parts of the press being arranged substantially as shown anddescribed, the operation is as follows: The driving-shaft being revolvedby power, as aforesaid, the pulleys R will carry the chains S in thesame continuous direction about themselves and the pulleys T. Thesechains will carry the inking-roll over the form placed on the bed B,then over the ink'plate G, and so on over each alternately, and, as theparts of this press are designed, downward over the form and upward overthe ink-plate. The springs g, acting against the bar U, will press thepulleys T in a direction from the pulleys R, thus keeping the chains Staut, and causing, owing to the form of the arms w and the drawing outof line of the chains as aforesaid, the inking-roll V to press 011 theform and ink-plate.

The parts of this press are so arranged that in working the press thedriving-shaft 0 will revolve in the direction shown by the arrows, andwill carry a pinion, Y, to work in the gear L, one-fourth the size ofthe latter, and pulleys R of proper size to carry the inking-roll Vtwice over the form and ink-plate to each revolution of the gear Lthatis, to each impression. The clutch N being in position to engage withthe hub of the gear L, the driving-shaft being revolved, and the platenH being at its greatest distance from the bed, the crank-arms J willraise the side arms M, and, by means of them, will carry the platentoward the bed, and, with them, forming toggle-j oints, will give thepressure for the impression. After the impression is given, the naturaltendency of the arms J and arms M is to fall down and the platen awayfrom the bed; but the teeth or projections 2 will rest on the cam W,which is so set on the shaft 0, and is of such form, as to allow thearms J to fall gradually and only so fast as the gear L, by means of theclutch N, carries the arms, until the platen has been removed ashort andsufiicient distance from the form on the bed, when the teeth orprojections 3 will engage with the teeth or projections z, and the armsand platen will be carried backward more rapidly as the revolution ofthe shaftO is quicker than the gear L, the clutch N allowing of thismotion without being thrown out, as aforesaid. After the platen has beencarried to its greatest distance from the bed it will rest there tillthe gear L again acts on the clutch, when the operation just describedwill be repeated.

Should the driving-shaft O, and hence the gear L, be revolved in theopposite direction from that just set forth, the clutch being beveled,as shown, the projection on hub of gear L will slide the clutch out ofengagement, and the chains S will continue in motion, while the platenwill remain at rest. So, by disengaging the clutch by hand, by means ofthe rod s, the movement of the platen toward the bed may be stopped whendesired. The cam W iii and the pinion Y may be so adjusted in relationto the pulleys R-that is, in relation to the position of the inking-rollV--that While the latter passes over the form twice for each impressionit will only pass over theform when the platen is a sufficient distancefrom the form or bed.

More than one inking-rollmay be used.

The inking-rolls may be made to pass over the form only once for eachimpression by properly proportioning the pulleys, gear, and pinion.

Other forms of chains or bands may be used than those shown, and otherforms of connections of the chains or bands with the inkingrolls toaccomplish the desired results by substantially the same principles setforth. The form of the teeth y and z or projections may be varied andaccomplish the same result.

I claim as my invention- 1. In an oscillating printing-press, one ormore inking-rolls carried over the form or bed and ink-plate by chainsor bands, said chains or bands passing about pulleys R on the maindriving-shaft O, and the pulleys T, the sets of pulleys being pressedfrom each other by means 2f springs g, substantially as hereinbefore setorth.

2. The combination of the bed B, revolving disk or ink-plate G, andchains or bands S, passing about pulleys R and T, and carrying theinking roll or rolls, substantially as hereinbefore described.

3. The combination of the chains or bands S, pulleys R and T, springs g,and levers w, bearing the inking-roll V, substantially as hereinbeforeset forth.

4.. In an oscillating press, the combination of the gear L, shaft K,bearing the cranks J and clutch N, described.

5. The combination of shaft 0, cam W, bearing the teeth or projection31, shaft K, bearing the teeth or projection z, substantially asheresubstantially as hereinbefore inbefore described.

6. The combination of shaft 0, pulleys R, chains or bands S, pulleys T,pinion Y, gear L, shaft K, crank-arms J, side arms N, and oscillatingplaten H, substantially as and for the purpose hereinbefore set forth.

7. The standards A, bed B, shell or cover F, and Ways or inking-rollguides d and 0, constructed and combined substantially as hereinbeforedescribed.

EDWARD DUMMER. Witnesses:

LOUIS COHEN, H. W. BRIOKER.

